Class 181/253 - With muffler bypass

Subclass of Class 181 - Acoustics
Definition: Subject matter having one or more passages, which performs
No. of patents: 31
Last issue date: 12/14/2010

Number	Title	Issue Date
7849960	Silencer The invention relates to a silencer for an airborne sound conducting pipe system, including a housing enclosing an interior space, an inlet pipe having an outlet within the interior space, a bypass pipe branching off from inlet pipe within the housing and having an ...	12/14/2010
7575096	Pressed assembly for passive valve installation A muffler assembly includes first and second muffler components that are each formed as a single piece. The first muffler component includes a first outlet pipe portion, a first bypass pipe mount portion, and a first resonator shell portion. The second muffler compo...	08/18/2009
7428947	Electrically controlled in-muffler exhaust valve for use during cylinder deactivation A powertrain control system is provided that includes an engine having multiple cylinders. A controller selectively activates the cylinders to provide a cylinder combination having a desired power displacement. In one example powertrain control system, the controlle...	09/30/2008
7416052	Exhaust system of internal combustion engine In an exhaust system, exhaust manifolds are connected to two banks provided in a V-type engine of a vehicle, respectively, to which front pipes each having a catalytic converter are connected to the exhaust manifolds, respectively. A muffler is provided at an exhaus...	08/26/2008
7416051	Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes An assembly useful in reducing aircraft engine noise such as turbofan engine noise (730) comprises: (1) at least one tube “H-Q” having an inlet end (738), an outlet end (740) and a central tube portion therebetween; an (ii) at least one actu...	08/26/2008
7380638	Exhaust noise control for motorcycles A noise control apparatus for a motorcycle exhaust system. The apparatus includes at least one exhaust pipe assembly having a direct pass-through mode and an indirect mode wherein exhaust gases are optionally directed through noise attenuating means. The apparatus i...	06/03/2008
7308967	Sound suppressor A sound suppressor for a firearm for reducing sound and flash levels upon the discharge of a firearm comprises a cylindrical housing, a proximal end cap with means for attachment to a firearm and to the cylindrical housing, a distal end cap with means for attachment...	12/18/2007
7243757	Exhaust muffler An exhaust muffler (1) invention includes an entry chamber (9), a resonator chamber (15), and a baffle chamber (23) positioned in serial order between an exhaust gas inlet (3) that lets exhaust gas into the entry chamber and an exh...	07/17/2007
7174992	Muffler with secondary flow path A muffler has a main body, and an inner shell spaced radially inwardly of the main body by an annular volume therebetween. The inner shell has an internal volume radially inward of the annular volume. The muffler has primary and secondary parallel paths therethrough...	02/13/2007
7117973	Noise suppressor apparatus for a gas duct A sound damping device (4) for a tubular duct (2), particularly a gas transporting tract of an internal combustion engine (1) having a least one bypass channel (5) running parallel to a main duct (6) in a section of the duct (2	10/10/2006
7073625	Exhaust gas muffler and flow director Either or both of an exhaust pipe coupled to the output end of an automobile engine collector pipe or the plurality of pipes coupled to the input apertures of the collector pipe from the engine are apertured along their lengths and contained within a further surroun...	07/11/2006
7055648	Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes An assembly useful in reducing aircraft engine noise such as turbofan engine noise (730) comprises: (i) at least one tube “H-Q” having an inlet end (738), an outlet end (740) and a central tube portion therebetween; and (ii) at least one act...	06/06/2006
7051523	Exhaust system assemblies employing wire bushings for thermal compensation Exhaust system assemblies employ wire bushings for thermal compensation to minimize noise due to “stick-slip” while the system cools. In a preferred embodiment, the wire bushings are formed of at least one strand of wire coiled about male end portions of pipe se...	05/30/2006
7040451	Automotive exhaust silencer system with variable damping characteristics In a muffler device of a motor vehicle, with a plurality of mufflers and an actuator for changing the flow resistance to the exhaust gases flowing through the mufflers, in order to change the damping characteristic, the actuator is provided in a pipe branch having a...	05/09/2006
7017707	Herschel-Quincke tube for vehicle applications An HQ tube arrangement suitable for packaging within a vehicle may be designed by creating a mathematical model representing a tube arrangement having a first passageway and a second passageway fluidly connected to the first passageway at first and second junctions....	03/28/2006
6938727	Integrated engine compartment component and air intake system A fan shroud includes a fan shroud portion having a surface including an aperture. A cooling fan is supported proximate to the aperture for permitting air flow through the fan shroud from the environment to the engine compartment. An air intake portion is supported ...	09/06/2005
6932189	Device for noise structuring in a motor vehicle A device for noise structuring in a motor vehicle has a plurality of gas-carrying lines connected to an internal combustion engine. At least two of the gas-carrying lines are acoustically linked together by at least one connection. ...	08/23/2005
6802387	Muffler with external water trap A vertical mount muffler (40) has an external water trap (52) in an exhaust pipe (48) and drains water from a point between the muffler housing upper outlet (46) and the terminal end (50) of the exhaust pipe. The water trap (52	10/12/2004
6595320	Apparatus for controlling exhaust gas in internal combustion engine An apparatus for controlling exhaust noise in an internal combustion engine uses the length difference between the exhaust pipe and the bypass pipe. The apparatus includes an exhaust pipe for outwardly releasing exhaust gas from the engine; a bypass pipe ...	07/22/2003
6467570	Spark arrester with spark filter An exhaust processor includes a housing formed to include an interior region and a partition or first spark arrester that partitions the interior region into chambers and includes a wool filter formed to include an opening. The wool filter is positioned t...	10/22/2002
6196187	Idle air bypass valve silencer A silencer for an idle air bypass valve in an internal combustion engine includes a grid disposed between the outlet of the idle air bypass valve and the intake manifold. The grid acts to reduce the air velocity entering into the intake manifold which dam...	03/06/2001
6178745	Exhaust assembly for use with combustion engines, and vehicle provided with such assembly An exhaust assembly for use with a motor vehicle having a combustion engine. The exhaust assembly includes an exhaust and a muffler having first and second gas flow routes. A control device controls the damping characteristic of the exhaust assembly by se...	01/30/2001
5979596	Automatic compression brake muffler An automatic compression brake muffler is provided including a muffler pipe. An auxiliary pipe is connected to the muffler pipe and defines passages which are offset from the muffler pipe. Next provided is a mechanical valve having an open orientation for...	11/09/1999
5947082	Idle air bypass valve silencer A silencer for an idle air bypass valve in an internal combustion engine includes a grid disposed between the outlet of the idle air bypass valve and the intake manifold. The grid acts to reduce the air velocity entering into the intake manifold which dam...	09/07/1999
5723827	Noise suppressing muffler A plurality of chambers are partitioned in a muffler by a baffle board. The muffler is provided with an exhaust gas passage for discharging exhaust gas outside the muffler via these chambers and a valve that bypasses a part of the exhaust passage. This va...	03/03/1998
5280143	Muffler with a scavenging effect A muffler disposed close to the atmospheric discharge end of the exhaust system, consisting of an accelerating part (4) which accelerates the exhaust gas flow and a negative pressure chamber (5) which generates negative pressure in association with the ac...	01/18/1994
4866933	Exhaust silencer An exhaust silencer for a car includes a housing, a partitioning diaphragm plate, a conduction pipe for conducting therethrough an exhaust gas from the car engine, an exhaust pipe exhausting thereout the exhaust gas to the atmosphere, an exhaust conduit c...	09/19/1989
4779705	Header exhaust adapter The apparatus would include a body portion positionable intermediate the exhaust manifold and the muffler or the catalytic converters if the car is adapted with such, so that exhaust gases, under a first condition, can flow through the body portion and in...	10/25/1988
4310067	Optimized diesel engine exhaust silencer An exhaust silencer system for piston type internal combustion engines hag a wet-exhaust, having a muffler and a muffler bypass which contains water at slow and moderate engine speeds, the water being expelled by the exhaust gas pressure at high engine s...	01/12/1982
3977493	Exhaust control method and apparatus An exhaust control method and apparatus for controlling the exhaust flow of an internal combustion engine to increase engine efficiency and power while suppressing the sound of the exhaust by both absorbing and canceling sound waves....	08/31/1976

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Class 181/253 - With muffler bypass